morning is that across the country, security will be ratcheted up at public events and workplaces and government offices because that's always the response that we need to have and unfortunately, it's going to be a fixed part of our lives i think forevermore. >> there's no question at time like these people are looking and remembering some of the terrible moments in our history, of course people think of 9/11, and that feeling of vulnerability but as you mentioned, tom, it's much too soon to know what the nature of this attack is. >> that's exactly the case. take oklahoma city, for example, which happened in 1995. we knew that that was a well defined terrorist attack, carried out by timothy mcveigh and his accomplices who were determined to bring down the federal government if they possibly could. you have to remember that 168 people were killed in oklahoma city. i was just there last week. i saw the memorial again, it's a very somber but beautiful place and everyone i talked to in oklahoma city said the residual effect of that bombing was it made the city more compassionate. it united people in